Short to Medium-Term Results with Two Types of Proximally Porous-Coated Long-Stemmed Femoral Components in Revision Surgery

Results using 30 long-stemmed femoral components in revision surgery were analyzed. There were 15 PCA (Howmedica) and 15 BIAS (Zimmer). The mean age was 50 years (range, 23 to 65 years) for the PCA group and 61 years (range, 35 to 75 years) for the BIAS group. The mean follow-up was 5.2 years (range, 2.5 to 10 years). Using the Endoklinik classification, there were 2 cases of Grade 1 bone defects, 16 cases of Grade 2, and 12 cases of Grade 3. Morcellized graft was used in 21 cases. A Kaplan-Meier survivorship analysis was carried out. The probabilities of re-revision, clinical failure, and loosening were 23%, 32% and 80% at eight years. Subsidence was very common, with means of 15mms in the PCA group and 19mms in the BIAS group. In the grafted cases, minor resorption was found in 17 cases and major resorption in 4 cases. Because of the frequency of poor results using these prostheses, due to failure to obtain bone ingrowth, even in femora with a good bone stock, we do not recommend their use in revision surgery. The results for the PCA and BIAS group were similar.